The Hegner saws are very finicky about the screws/bolts holding everything together. If one of your motor bolts is stripped out, I'd either drill and tap to the next size or Heli-coil the hole back to original. I know for fact that if you loosen the 3 bolts that hold the saw to the stand, there is an order in which you should tighten them to avoid vibration. I experimented with mine and it is true. If I recall, you have to tighten the two front bolts nearest the operator and then snug the 3rd at the rear of the saw. As for the insert, if you feel a need to have a zero clearance insert, just take a playing card, slit it half way through and then tape it to the table top. If it gets "wollered" out, just put a new card in it's place.